usb: serial: fix memory leak in generic driver

Fix a regression introduced by commit
715b1dc01fe44537e8fce9566e4bb48d6821d84b ("USB: usb_debug,
usb_generic_serial: implement multi urb write").

URB transfer buffer was never freed when using multi-urb writes.
Currently the only driver enabling multi-urb writes is usb_debug.

Signed-off-by: Johan Hovold <[email protected]>
Cc: Greg KH <[email protected]>
Acked-by: Jason Wessel <[email protected]>
Cc: stable <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

diff --git a/drivers/usb/serial/generic.c b/drivers/usb/serial/generic.c
index 5ce033ab9b99cbd16277c6e299b5bf05ad80e433..83443d6306d60e03f5b60ea0f9c4b70ae01f292b 100644 (file)
--- a/drivers/usb/serial/generic.c
+++ b/drivers/usb/serial/generic.c
@@ -489,6 +489,8 @@ void usb_serial_generic_write_bulk_callback(struct urb *urb)
        dbg("%s - port %d", __func__, port->number);
 
        if (port->serial->type->max_in_flight_urbs) {
+               kfree(urb->transfer_buffer);
+
                spin_lock_irqsave(&port->lock, flags);
                --port->urbs_in_flight;
                port->tx_bytes_flight -= urb->transfer_buffer_length;